Steel corrugated pipe culvert (1) Made of sand and gravel or materials identical to the subgrade fill. (2) Symmetrical construction, layered backfill, with each layer 20cm thick. (3) Culvert pipe
Mechanically compact the sides near the area, and use a "water-tight" vibrator to compact the coarse sand beneath the pipe bottom. (4) Employ a vibration compactor to compact layer by layer. The degree of compactness is not specified.
Less than 95%.(5) After thickness exceeds 30cm, use static compaction with a roller; after soil thickness exceeds 60cm, use vibratory compaction with a roller; the degree of compaction should not be less than...
At 95%.
